/* jshint forin:true, noarg:true, noempty:true, eqeqeq:true, boss:true, undef:true, curly:true, browser:true, jquery:true */
/*
 * jQuery MultiSelect UI Widget 1.12
 * Copyright (c) 2011 Eric Hynds
 *
 * http://www.erichynds.com/jquery/jquery-ui-multiselect-widget/
 *
 * Depends:
 *   - jQuery 1.4.2+
 *   - jQuery UI 1.8 widget factory
 *
 * Optional:
 *   - jQuery UI effects
 *   - jQuery UI position utility
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
*/
(function($, undefined){

    var multiselectID = 0;

    $.widget("ech.multiselect", {
	
        // default options
        options: {
            header: true,
            height: 175,
            minWidth: 225,
            classes: '',
            checkAllText: 'Marcar todo',
            uncheckAllText: 'Desmarcar todo',
            noneSelectedText: 'Seleccionar',
            selectedText: '# Seleccionados',
            selectedList: 0,
            show: '',
            hide: '',
            autoOpen: false,
            multiple: true,
            position: {}
        },

        _create: function(){
            var el = this.element.hide(),
            o = this.options;
		
            this.speed = $.fx.speeds._default; // default speed for effects
            this._isOpen = false; // assume no
	
            var 
            button = (this.button = $('<button type="button"><span class="ui-icon ui-icon-triangle-2-n-s"></span></button>'))
            .addClass('ui-multiselect ui-widget ui-state-default ui-corner-all')
            .addClass( o.classes )
            .attr({
                'title':el.attr('title'), 
                'aria-haspopup':true, 
                'tabIndex':el.attr('tabIndex')
            })
            .insertAfter( el ),
			
            buttonlabel = (this.buttonlabel = $('<span />'))
            .html( o.noneSelectedText )
            .appendTo( button ),
				
            menu = (this.menu = $('<div />'))
            .addClass('ui-multiselect-menu ui-widget ui-widget-content ui-corner-all')
            .addClass( o.classes )
            .appendTo( document.body ),
				
            header = (this.header = $('<div />'))
            .addClass('ui-widget-header ui-corner-all ui-multiselect-header ui-helper-clearfix')
            .appendTo( menu ),
				
            headerLinkContainer = (this.headerLinkContainer = $('<ul />'))
            .addClass('ui-helper-reset')
            .html(function(){
                if( o.header === true ){
                    return '<li><a class="ui-multiselect-all" href="#"><span class="ui-icon ui-icon-check"></span><span>' + o.checkAllText + '</span></a></li><li><a class="ui-multiselect-none" href="#"><span class="ui-icon ui-icon-closethick"></span><span>' + o.uncheckAllText + '</span></a></li>';
                } else if(typeof o.header === "string"){
                    return '<li>' + o.header + '</li>';
                } else {
                    return '';
                }
            })
            .append('<li class="ui-multiselect-close"><a href="#" class="ui-multiselect-close"><span class="ui-icon ui-icon-circle-close"></span></a></li>')
            .appendTo( header ),
			
            checkboxContainer = (this.checkboxContainer = $('<ul />'))
            .addClass('ui-multiselect-checkboxes ui-helper-reset')
            .appendTo( menu );
		
            // perform event bindings
            this._bindEvents();
		
            // build menu
            this.refresh( true );
		
            // some addl. logic for single selects
            if( !o.multiple ){
                menu.addClass('ui-multiselect-single');
            }
        },
	
        _init: function(){
            if( this.options.header === false ){
                this.header.hide();
            }
            if( !this.options.multiple ){
                this.headerLinkContainer.find('.ui-multiselect-all, .ui-multiselect-none').hide();
            }
            if( this.options.autoOpen ){
                this.open();
            }
            if( this.element.is(':disabled') ){
                this.disable();
            }
        },
	
        refresh: function( init ){
            var el = this.element,
            o = this.options,
            menu = this.menu,
            checkboxContainer = this.checkboxContainer,
            optgroups = [],
            html = [],
            id = el.attr('id') || multiselectID++; // unique ID for the label & option tags
		
            // build items
            el.find('option').each(function( i ){
                var $this = $(this), 
                parent = this.parentNode,
                title = this.innerHTML,
                description = this.title,
                value = this.value,
                inputID = this.id || 'ui-multiselect-' + id + '-option-' + i,
                isDisabled = this.disabled,
                isSelected = this.selected,
                labelClasses = ['ui-corner-all'],
                optLabel;
			
                // is this an optgroup?
                if( parent.tagName.toLowerCase() === 'optgroup' ){
                    optLabel = parent.getAttribute('label');
				
                    // has this optgroup been added already?
                    if( $.inArray(optLabel, optgroups) === -1 ){
                        html.push('<li class="ui-multiselect-optgroup-label"><a href="#">' + optLabel + '</a></li>');
                        optgroups.push( optLabel );
                    }
                }
		
                if( isDisabled ){
                    labelClasses.push('ui-state-disabled');
                }

                // browsers automatically select the first option
                // by default with single selects
                if( isSelected && !o.multiple ){
                    labelClasses.push('ui-state-active');
                }
			
                html.push('<li class="' + (isDisabled ? 'ui-multiselect-disabled' : '') + '">');
			
                // create the label
                html.push('<label for="' + inputID + '" title="' + description + '" class="' + labelClasses.join(' ') + '">');
                html.push('<input id="' + inputID + '" name="multiselect_' + id + '" type="' + (o.multiple ? "checkbox" : "radio") + '" value="' + value + '" title="' + title + '"');

                // pre-selected?
                if( isSelected ){
                    html.push(' checked="checked"');
                    html.push(' aria-selected="true"');
                }

                // disabled?
                if( isDisabled ){
                    html.push(' disabled="disabled"');
                    html.push(' aria-disabled="true"');
                }

                // add the title and close everything off
                html.push(' /><span>' + title + '</span></label></li>');
            });
		
            // insert into the DOM
            checkboxContainer.html( html.join('') );

            // cache some moar useful elements
            this.labels = menu.find('label');
		
            // set widths
            this._setButtonWidth();
            this._setMenuWidth();
		
            // remember default value
            this.button[0].defaultValue = this.update();
		
            // broadcast refresh event; useful for widgets
            if( !init ){
                this._trigger('refresh');
            }
        },
	
        // updates the button text. call refresh() to rebuild
        update: function(){
            var o = this.options,
            $inputs = this.labels.find('input'),
            $checked = $inputs.filter('[checked]'),
            numChecked = $checked.length,
            value;
		
            if( numChecked === 0 ){
                value = o.noneSelectedText;
            } else {
                if($.isFunction( o.selectedText )){
                    value = o.selectedText.call(this, numChecked, $inputs.length, $checked.get());
                } else if( /\d/.test(o.selectedList) && o.selectedList > 0 && numChecked <= o.selectedList){
                    value = $checked.map(function(){
                        return $(this).next().text();
                    }).get().join(', ');
                } else {
                    value = o.selectedText.replace('#', numChecked).replace('#', $inputs.length);
                }
            }
		
            this.buttonlabel.html( value );
            return value;
        },
	
        // binds events
        _bindEvents: function(){
            var self = this, button = this.button;
		
            function clickHandler(){
                self[ self._isOpen ? 'close' : 'open' ]();
                return false;
            }
		
            // webkit doesn't like it when you click on the span :(
            button
            .find('span')
            .bind('click.multiselect', clickHandler);
		
            // button events
            button.bind({
                click: clickHandler,
                keypress: function( e ){
                    switch(e.which){
                        case 27: // esc
                        case 38: // up
                        case 37: // left
                            self.close();
                            break;
                        case 39: // right
                        case 40: // down
                            self.open();
                            break;
                    }
                },
                mouseenter: function(){
                    if( !button.hasClass('ui-state-disabled') ){
                        $(this).addClass('ui-state-hover');
                    }
                },
                mouseleave: function(){
                    $(this).removeClass('ui-state-hover');
                },
                focus: function(){
                    if( !button.hasClass('ui-state-disabled') ){
                        $(this).addClass('ui-state-focus');
                    }
                },
                blur: function(){
                    $(this).removeClass('ui-state-focus');
                }
            });

            // header links
            this.header
            .delegate('a', 'click.multiselect', function( e ){
                // close link
                if( $(this).hasClass('ui-multiselect-close') ){
                    self.close();
			
                // check all / uncheck all
                } else {
                    self[ $(this).hasClass('ui-multiselect-all') ? 'checkAll' : 'uncheckAll' ]();
                }
			
                e.preventDefault();
            });
		
            // optgroup label toggle support
            this.menu
            .delegate('li.ui-multiselect-optgroup-label a', 'click.multiselect', function( e ){
                e.preventDefault();
				
                var $this = $(this),
                $inputs = $this.parent().nextUntil('li.ui-multiselect-optgroup-label').find('input:visible:not(:disabled)'),
                nodes = $inputs.get(),
                label = $this.parent().text();
				
                // trigger event and bail if the return is false
                if( self._trigger('beforeoptgrouptoggle', e, {
                    inputs:nodes, 
                    label:label
                }) === false ){
                    return;
                }
				
                // toggle inputs
                self._toggleChecked(
                    $inputs.filter('[checked]').length !== $inputs.length,
                    $inputs
                    );

                self._trigger('optgrouptoggle', e, {
                    inputs: nodes,
                    label: label,
                    checked: nodes[0].checked
                });
            })
            .delegate('label', 'mouseenter.multiselect', function(){
                if( !$(this).hasClass('ui-state-disabled') ){
                    self.labels.removeClass('ui-state-hover');
                    $(this).addClass('ui-state-hover').find('input').focus();
                }
            })
            .delegate('label', 'keydown.multiselect', function( e ){
                e.preventDefault();
				
                switch(e.which){
                    case 9: // tab
                    case 27: // esc
                        self.close();
                        break;
                    case 38: // up
                    case 40: // down
                    case 37: // left
                    case 39: // right
                        self._traverse(e.which, this);
                        break;
                    case 13: // enter
                        $(this).find('input')[0].click();
                        break;
                }
            })
            .delegate('input[type="checkbox"], input[type="radio"]', 'click.multiselect', function( e ){
                var $this = $(this),
                val = this.value,
                checked = this.checked,
                tags = self.element.find('option');
				
                // bail if this input is disabled or the event is cancelled
                if( this.disabled || self._trigger('click', e, {
                    value: val, 
                    text: this.title, 
                    checked: checked
                }) === false ){
                    e.preventDefault();
                    return;
                }

                // make sure the input has focus. otherwise, the esc key
                // won't close the menu after clicking an item.
                $this.focus();
				
                // toggle aria state
                $this.attr('aria-selected', checked);
				
                // change state on the original option tags
                tags.each(function(){
                    if( this.value === val ){
                        this.selected = checked;
                    } else if( !self.options.multiple ){
                        this.selected = false;
                    }
                });
				
                // some additional single select-specific logic
                if( !self.options.multiple ){
                    self.labels.removeClass('ui-state-active');
                    $this.closest('label').toggleClass('ui-state-active', checked );
					
                    // close menu
                    self.close();
                }

                // fire change on the select box
                self.element.trigger("change");
				
                // setTimeout is to fix multiselect issue #14 and #47. caused by jQuery issue #3827
                // http://bugs.jquery.com/ticket/3827 
                setTimeout($.proxy(self.update, self), 10);
            });

            // close each widget when clicking on any other element/anywhere else on the page
            $(document).bind('mousedown.multiselect', function( e ){
                if(self._isOpen && !$.contains(self.menu[0], e.target) && !$.contains(self.button[0], e.target) && e.target !== self.button[0]){
                    self.close();
                }
            });

            // deal with form resets.  the problem here is that buttons aren't
            // restored to their defaultValue prop on form reset, and the reset
            // handler fires before the form is actually reset.  delaying it a bit
            // gives the form inputs time to clear.
            $(this.element[0].form).bind('reset.multiselect', function(){
                setTimeout($.proxy(self.refresh, self), 10);
            });
        },

        // set button width
        _setButtonWidth: function(){
            var width = this.element.outerWidth(),
            o = this.options;
			
            if( /\d/.test(o.minWidth) && width < o.minWidth){
                width = o.minWidth;
            }
		
            // set widths
            this.button.width( width );
        },
	
        // set menu width
        _setMenuWidth: function(){
            var m = this.menu,
            width = this.button.outerWidth()-
            parseInt(m.css('padding-left'),10)-
            parseInt(m.css('padding-right'),10)-
            parseInt(m.css('border-right-width'),10)-
            parseInt(m.css('border-left-width'),10);
				
            m.width( width || this.button.outerWidth() );
        },
	
        // move up or down within the menu
        _traverse: function( which, start ){
            var $start = $(start),
            moveToLast = which === 38 || which === 37,
			
            // select the first li that isn't an optgroup label / disabled
            $next = $start.parent()[moveToLast ? 'prevAll' : 'nextAll']('li:not(.ui-multiselect-disabled, .ui-multiselect-optgroup-label)')[ moveToLast ? 'last' : 'first']();
		
            // if at the first/last element
            if( !$next.length ){
                var $container = this.menu.find('ul').last();
			
                // move to the first/last
                this.menu.find('label')[ moveToLast ? 'last' : 'first' ]().trigger('mouseover');
			
                // set scroll position
                $container.scrollTop( moveToLast ? $container.height() : 0 );
			
            } else {
                $next.find('label').trigger('mouseover');
            }
        },

        // This is an internal function to toggle the checked property and
        // other related attributes of a checkbox.
        //
        // The context of this function should be a checkbox; do not proxy it.
        _toggleState: function( prop, flag ){
            return function(){
                if( !this.disabled ) {
                    this[ prop ] = flag;
                }

                if( flag ){
                    this.setAttribute('aria-selected', true);
                } else {
                    this.removeAttribute('aria-selected');
                }
            };
        },

        _toggleChecked: function( flag, group ){
            var $inputs = (group && group.length) ?
            group :
            this.labels.find('input'),

            self = this;

            // toggle state on inputs
            $inputs.each(this._toggleState('checked', flag));

            // give the first input focus
            $inputs.eq(0).focus();
		
            // update button text
            this.update();
		
            // gather an array of the values that actually changed
            var values = $inputs.map(function(){
                return this.value;
            }).get();

            // toggle state on original option tags
            this.element
            .find('option')
            .each(function(){
                if( !this.disabled && $.inArray(this.value, values) > -1 ){
                    self._toggleState('selected', flag).call( this );
                }
            });

            // trigger the change event on the select
            if( $inputs.length ) {
                this.element.trigger("change");
            }
        },

        _toggleDisabled: function( flag ){
            this.button
            .attr({
                'disabled':flag, 
                'aria-disabled':flag
            })[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');
		
            this.menu
            .find('input')
            .attr({
                'disabled':flag, 
                'aria-disabled':flag
                })
            .parent()[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');
		
            this.element
            .attr({
                'disabled':flag, 
                'aria-disabled':flag
            });
        },
	
        // open the menu
        open: function( e ){
            var self = this,
            button = this.button,
            menu = this.menu,
            speed = this.speed,
            o = this.options;
		
            // bail if the multiselectopen event returns false, this widget is disabled, or is already open 
            if( this._trigger('beforeopen') === false || button.hasClass('ui-state-disabled') || this._isOpen ){
                return;
            }
		
            var $container = menu.find('ul').last(),
            effect = o.show,
            pos = button.offset();
		
            // figure out opening effects/speeds
            if( $.isArray(o.show) ){
                effect = o.show[0];
                speed = o.show[1] || self.speed;
            }
		
            // set the scroll of the checkbox container
            $container.scrollTop(0).height(o.height);
		
            // position and show menu
            if( $.ui.position && !$.isEmptyObject(o.position) ){
                o.position.of = o.position.of || button;
			
                menu
                .show()
                .position( o.position )
                .hide()
                .show( effect, speed );
		
            // if position utility is not available...
            } else {
                menu.css({ 
                    top: pos.top + button.outerHeight(),
                    left: pos.left
                }).show( effect, speed );
            }
		
            // select the first option
            // triggering both mouseover and mouseover because 1.4.2+ has a bug where triggering mouseover
            // will actually trigger mouseenter.  the mouseenter trigger is there for when it's eventually fixed
            this.labels.eq(0).trigger('mouseover').trigger('mouseenter').find('input').trigger('focus');
		
            button.addClass('ui-state-active');
            this._isOpen = true;
            this._trigger('open');
        },
	
        // close the menu
        close: function(){
            if(this._trigger('beforeclose') === false){
                return;
            }
	
            var o = this.options, effect = o.hide, speed = this.speed;
		
            // figure out opening effects/speeds
            if( $.isArray(o.hide) ){
                effect = o.hide[0];
                speed = o.hide[1] || this.speed;
            }
	
            this.menu.hide(effect, speed);
            this.button.removeClass('ui-state-active').trigger('blur').trigger('mouseleave');
            this._isOpen = false;
            this._trigger('close');
        },

        enable: function(){
            this._toggleDisabled(false);
        },
	
        disable: function(){
            this._toggleDisabled(true);
        },
	
        checkAll: function( e ){
            this._toggleChecked(true);
            this._trigger('checkAll');
        },
	
        uncheckAll: function(){
            this._toggleChecked(false);
            this._trigger('uncheckAll');
        },
	
        getChecked: function(){
            return this.menu.find('input').filter('[checked]');
        },
	
        destroy: function(){
            // remove classes + data
            $.Widget.prototype.destroy.call( this );
		
            this.button.remove();
            this.menu.remove();
            this.element.show();
		
            return this;
        },
	
        isOpen: function(){
            return this._isOpen;
        },
	
        widget: function(){
            return this.menu;
        },
	
        // react to option changes after initialization
        _setOption: function( key, value ){
            var menu = this.menu;
		
            switch(key){
                case 'header':
                    menu.find('div.ui-multiselect-header')[ value ? 'show' : 'hide' ]();
                    break;
                case 'checkAllText':
                    menu.find('a.ui-multiselect-all span').eq(-1).text(value);
                    break;
                case 'uncheckAllText':
                    menu.find('a.ui-multiselect-none span').eq(-1).text(value);
                    break;
                case 'height':
                    menu.find('ul').last().height( parseInt(value,10) );
                    break;
                case 'minWidth':
                    this.options[ key ] = parseInt(value,10);
                    this._setButtonWidth();
                    this._setMenuWidth();
                    break;
                case 'selectedText':
                case 'selectedList':
                case 'noneSelectedText':
                    this.options[key] = value; // these all needs to update immediately for the update() call
                    this.update();
                    break;
                case 'classes':
                    menu.add(this.button).removeClass(this.options.classes).addClass(value);
                    break;
            }
		
            $.Widget.prototype._setOption.apply( this, arguments );
        }
    });

})(jQuery);
